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    <h1>
      <a href="../index.html">all files</a> / <a href="index.html">service/</a> EMAService.ts
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        <span class="strong">94.12% </span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { Injectable } from '@angular/core';
import { QuoteBasic } from 'service/QuoteBasic';
&nbsp;
import { IEMAService } from 'interface/IEMAService';
&nbsp;
@Injectable()
export class EMAService implements IEMAService {
&nbsp;
  connection;
&nbsp;
  constructor() {
&nbsp;
  }
&nbsp;
  compute(quote:QuoteBasic, day:number):Array&lt;any&gt; {
    const emaList = [];
    const count = quote.close.length;
    const x = 2.0 / (day + 1);
    if(day &gt; 0){
      for (let i=0; i&lt;count; i++) {
        if (i == 0) {
          emaList.push(quote.close[i])
          continue;
        }
        const ema = x*quote.close[i] + (1-x)*emaList[i-1];
        emaList.push(parseFloat(ema.toFixed(4)));
      }
    }
    return emaList;
  }
&nbsp;
  update(quote:QuoteBasic, day:number, oldList:Array&lt;any&gt;):Array&lt;any&gt; {
    const orignCount = quote.close.length;
    const oldCount = oldList.length;
&nbsp;
    if(day &gt; 0 &amp;&amp; orignCount &gt; 0){
      const x = 2.0 / (day + 1);
&nbsp;
      if (orignCount === 1) {
        <span class="missing-if-branch" title="if path not taken" >I</span>if (oldList.length === 0) {
<span class="cstat-no" title="statement not covered" >          oldList.push(quote.close[0]);</span>
        } else {
          oldList[0] = quote.close[0];
        }
        return oldList;
      } else if (oldCount === 0) {
        return this.compute(quote, day);
      }
&nbsp;
      <span class="missing-if-branch" title="if path not taken" >I</span>if (orignCount === oldCount) {
<span class="cstat-no" title="statement not covered" >        oldList[oldCount-1] = parseFloat((x*quote.close[oldCount-1] + (1-x)*oldList[oldCount-2]).toFixed(4));</span>
      } else {
        let addCount = orignCount -oldCount;
        for (let i = 0; i &lt; addCount; i++) {
          const d = parseFloat((x*quote.close[orignCount-1-i] + (1-x)*oldList[orignCount-2-i]).toFixed(4));
          oldList.push(d);
        }
      }
    }
&nbsp;
    return oldList;
  }
}
&nbsp;</pre></td></tr>
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